1. Department of Dermatology Osaka City University Graduate School of Medicine 1‐4‐3 Asahimachi, Abeno‐ku Osaka 545‐8585 Japan
2. Department of Oral and Maxillofacial Surgery Osaka City University Graduate School of Medicine 1‐4‐3 Asahimachi, Abeno‐ku Osaka 545‐8585 Japan